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三角形内角和
Author:
谢鹏
GeoGebra
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撒针估算面积实验
圓的基本性質
百分數及其應用
圓的切線方程
直線的斜率：水平變化 & 鉛垂變化
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平行線
Sunline
ycmc P5 Math lesson 1-1
GeoGebra研習作品
새로운 양식
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Rectangle
Volume
Special Points
Sphere
Statistical Characteristics